Last modified: 2011-12-20 12:47:58 UTC

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Bug 31170 - centralauth needs a read-only db flag that allows queries to go to lagged slaves
centralauth needs a read-only db flag that allows queries to go to lagged slaves
Status: RESOLVED FIXED
Product: MediaWiki extensions
Classification: Unclassified
CentralAuth (Other open bugs)
unspecified
All All
: High major with 3 votes (vote)
: ---
Assigned To: Sam Reed (reedy)
: platformeng
Depends on:
Blocks:
  Show dependency tree / graph
 
Reported: 2011-09-26 19:11 UTC by Asher Feldman
Modified: 2011-12-20 12:47 UTC (History)
6 users (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---

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Description Asher Feldman 2011-09-26 19:11:55 UTC 
There doesn't currently seem to be a way to set centralauth to read-only which results in a site outage when its master needs to be rotated.

When the cluster with centralauth is set to read-only (currently S7), it only applies to wikis also on that cluster.  Other wikis will still both want to write to centralauth, and also only send their queries to a caught up slave, which there won't be any of for a time during a master switch.  

Normally, when a cluster has $wgReadOnly = true, queries are sent to any slave and replication lag checking is disabled.  Setting centralauth to read-only needs this behavior as well.
Comment 1 Rob Lanphier 2011-09-26 19:44:14 UTC 
Created new "platformeng" keyword, and adding that to this bug.  I'll have to coordinate with Tim as to who exactly fixes this bug, but it looks like one we need to address soon.
Comment 2 Sam Reed (reedy) 2011-12-20 12:25:50 UTC 
r106784 adds $wgCentralAuthReadOnly

Just need to look at the lag checking code now
Comment 3 Sam Reed (reedy) 2011-12-20 12:47:58 UTC 
Not sure there is a need for anything else
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